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上海某建筑公司木工陈某在某花园工地3号楼12层撬拆模板作业时，用力过度，人失去重心，身体撞击脚手架横杆后，由于未系安全带，从2.6m高处坠落于地，造成2根肋骨骨折。事故原因分析：（）。
3～12岁内，有明显的主动性，爱探究、好攻击、易激惹、喜欢自我表现的阶段属于（）
In every cultivated language, there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words（1）which we become acquainted in daily conversation, which we（2）,that is to say, from the（3） of our own family and from our familiar associates, and（4） we should know and use （5 ）we could not read or write. They （6） the common things of life, and are the stock in trade of all who （7） the language. Such words may be called“popular”, since they belong to the people （8） and are not the exclusive （9） of a limited class. On the other hand, our language （10） a multitude of words which are comparatively （11） used in ordinary conversation. Their meanings are known to every educated person, but there is little （12） to use them at home or in the market-place. Our （13） acquaintance with them comes not from our mother's （14） or from the talk of our school-mates, （15） from books that we read, lectures that we （16） ,or the more （17）conversation of highly educated speakers who are discussing some particular （18） n a style appropriately elevated above the habitual（19） f everyday life. Such words are called“learned”, and the （20） between them and the“popular”words is of great importance to a right understanding of linguistic process. 请在18处填上正确答案（）
留下《骆驼祥子》《四世同堂》《茶馆》《龙须沟》等作品的作家是（ ）。
有关咽隐窝的说法，下列哪项是错误的（）
白交通支进入交感干神经节后的三种去向不包括（）。
用来控制液动机的流量以实现工作机构速度调节的液压元件。常用的有节流阀、调建阀、分流阀以及这些阀与单向阀、行程阀组合的流量阀，称为（）
从国际惯例上来看，广告公司收取代理费的标准是（）。
何谓染色牢度，主要有哪些指标来评价染料的染色牢度？
诊断横纹肌肉瘤首选下列哪项特殊染色方法？（）